D-Ketocarboxylic acids

Addition of enamines to carbon-carbon double bonds d-Ketocarboxylic acid esters from enamines... 

Midiael-type addition with O-silyl O-alkyl keteneacetals d-Ketocarboxylic acid esters from c, -ethyleneketones... 

In another procedure, D-amino acid oxidase (52) is usehil to produce L-amino acids from DL-amino acids. a-Ketocarboxylic acids which are formed by the action of enzymes on D-amino acids, are aminated to form L-amino acids by coupling through the action of amino acid aminotransferases (53). 

Hummel W, Schiitte H, Kula MR (1985) D-2-Hydroxyisocaproate dehydrogenase from Lactobacillus casei. A new enzyme suitable for stereospedfic reduction of 2-ketocarboxylic acids. Appl Microbiol Biotechnol 21 7-15... 

D-Glucose orthoesters of complex alcohols can be easily obtained with the help of silver salicylate Alcohols and amines can be conveniently prepared from olefins by ozonization-reduction and ozoni-zation-reductive amination respectively without isolation of intermediates Inverted amines can be obtained from optically-active alcohols through stereospecific formation of N-alkylphthalimides 3-Methoxy-l-phenyl-l-propyne has been used as starting material for the synthesis of a,/ -unsatd. carbonyl compounds through allenic di-carbanions a-Ketocarboxylic acids can be easily prepared from cyanohydrins through a Ritter reaction... 

Syntheses with titanium tetrachloride d-Alkoxy-/ -ketocarboxylic acid esters from acetals... 

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